The cop would probably be very suspicious. Maybe you could get charged with some kind of public intoxication, but it's not illegal to smoke it at home. Honestly though, it's not something you would want to do anywhere but an extremely comfortable environment.

I think a lot of salvia dealers say the salvia is for incense use only just because they don't want to be held responsible if someone does trip out in public and do something really stupid. No one really burns it as incense, though.